Crushing-mill.



Witwe/ao A Y -11.13. EMORY.' GRUSHING MILL.

APPLIGATION FILED FEBJI, 1910.

1,002,379. Patented sep1.5,1911.

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ARTHUR B. EMORY, OF CANON CITY, COLORADO.

CRUSI-IING-MILL.

Specification of Letters Patent.

Patented Sept. 5, 1911.

Application led February 11, 1910. Serial No. 543,250.

To all whom it may concern.

Be it known that I, ARTHUR B. EMORY, a citizen of the United States,residing at Canon City, in the county of Fremont and State of Colorado,have invented a new and useful Crushing-Mill, of which the following isa specification.

This invention is a mill designed primarily for reducing and crushingores, and it has for its object to provide a simple and highly eflicientmill of this kind adapted for placer mining, as well as for all freemilling ores, and which will operate without loss of any of the values.

lVit-h the herein stated objects in view, the invention consists in anovel construction and arrangement of the parts to be hreinafterdescribed and claimed, and in order that the invention may be fullyunderstood, reference is had to the accompanying drawing forming a partof this specification, in which, v

Figure 1 is a central longitudinal section of the mill, and Fig. 2 is across section on the line 2-2 of Fig. 1.

Referring more particularly to the drawing, 5 denotes a suitableframework on which the mill is mounted. In a boX 6 supported on thisframework, are located two pairs of crushing rollers 7 and 8,respectively, the shafts of said rollers being supported in bearings 9.These bearings are adjustable as usual in crushing mills so that therollers may be set apart the required distance. Beneath the bottom pairof rollers-is mounted a rotary table 10 on which the material as itissues from between the rollers drops. This table is circular, and hasat the bottom a pivot stud l1 mounted in a step bearing 12 formed at theouter end of spider arms 13 extending from the frame 5 of the mill belowthe table.

The table 10 is rotated by means of a pinion 14 on a shaft 15, saidpinion meshing with an annular rack 16 formed on the bottom of thetable. The shaft 15 is provided with a drive pulley 17, and is mountedin suitable bearings 18 carried by the frame 5. One of the spider arms13 also has a longitudinal bore 19 through which the shaft eX- tends.

Below the table is located a circular track 20 provided withanti-friction rollers 2l engageable with the bottom of the table, nearthe edge thereof, to preventthe table from being tilted by the weight ofthe material thereon, when the mill is in operation.

The shaft 15 extends parallel with the rollers 7 and 8 and is employedfor driving the same also, the following gearing being provided for thispurpose: On the shaft are fastened spur gears 22 in mesh with pinions 23fastened on the ends of the shaft 24 of one of the bottom rollers 8. Onthe ends of the shaft 25 of the other bottom roller, are fast sprocketwheels 26 which are connected by chains 27 to sprocket wheels 28 on theshaft 15. The top rollers 7 are driven from the bottom rollers, theshaft of said bottom rollers being provided with sprocket wheels 29which are connected by chains 30 to sprocket wheels 31 on the shafts ofthe top rollers.

Beneath the table 10 is mounted a receptacle 32 having a hopper bottom33. This receptacle is designed to hold a supply of mercury or someother amalgamating agent as indicated at 34, said agent being placed inthe hopper bottom, and above the level of the amalgamating agent, thehopper has an outlet opening 35. The receptacle 32 is supported on theframe 5 by suitable catches 36 in such a way that it may be removed.

At 37 is indicated a hose by which water is conducted to the table 10for the purpose of washing the crushed material off the same into thereceptacle 32.

In the upper portion of the box 6 is located a feed hopper 38 arrangedto discharge the material to be crushed between the top rollers 7.

In operation, the material to be crushed is thrown into the hopper 38,and is fed thereby between the top rollers 7. Inasmuch as two sets ofcrushing rollers are provided, the material is crushed twice, afterwhich it drops on the rotating table 10. It is prevented from adheringto the table by directing a stream of water thereonto from the hose 37.The crushed material is thus washed. into the receptacle 32, in whichamalgamation takes place. The water escapes through the outlet opening35. If desired the material can be run into vats, and the cyanid processemployed.

The mill is adapted for placer mining, as well as for free milling ore.It saves all the free gold, and polishes the rough gold,

40 tating more rapidly than those portions Y and crushes all the quartzcontaining gold [which is usually lostV in the sluice box. A .very smallquantity of water is required to operate the mill, which adapts it moreespecially for localities having a limited water supply. The mill canalso be used for crushing brick and other material, and as many or asfewsets of rollers as are necessary for the required work may be provided.By using one set of rollers, vthe mill can also be used for crushingfeed.

The revolving table 10 pulverizes the material still finer as it dropsthereon from the rollers, and polishes the rusty gold, and

scatters the pulverizedsubstance over the surface of theamalgamatingagent.

I consider the provision of a table rotating in a horizontal plane,beneath Vand inv 'rolls where it is given the second crushing,

and thence it falls upon the table. VThat portion of theimaterial whichfalls at the center of the table turns around and around until it isdissipated, but that portion which falls between the ends of the lowerpair of rolls reaches the table where the latter is revolving in eitherone direction or the other and by the table is carried out from underthe adjacent roller. No part of the latter from the center to itsextremity is revolving Vin the same ratio with respect to the surface ofthe table as any other part, that portion of the table near itsperiphery of course ronear its center. It follows, therefore, that thematerial, even after having been given its second crushing between thelowermcst pair of rolls, is given a third crushing by a grinding actionbetween the lower sides of the lower rolls and a section of the table,and this would not be the case if the rolls were conical as is sometimesemployed in this type of machine.

What is claimed is 1. In a crushing mill, the combination with a fiatcircular table rot-ating on a vertical axis, of a pair of cylindricalrolls disposed across and above said table with their axes lying inparallel chords of said table equi-distant from a true diameter throughsaid table and their upper sides rotating toward each other at the sainespeed, and means for delivering the material to a point between saidrolls.

2. In a crushing mill, the combination with a flat circular tablerotating on a vertical axis, of a pair of cylindrical rolls disposedacross and above said table with their axes lying in parallel chords ofsaid table and their upper sides rotating toward each other at the samespeed, a second pair of rolls above the first pair and rotating towardeach other, and means for feeding material between the uppermost pair.

3. In a crushing mill, the combination with a spider having a stepbearing, a horizontal circular table having a stud journaled in saidbearing, an annular rack on the lower face of the table, a shaftextending through the spider beneath said bearing, a pinion fast on theshaft meshing with said rack, and means for rotating continuously in onedirection; of a pair of cylindrical rolls disposed across and above thesurface of said table with their axes lying in parallel chords of saidtable, a gear pinion on the shaft of one roll and a sprocket wheel onthe shaft of the other, a spur gear on the driving shaft connected withsaid gear pinion, and a sprocket wheel also on said driving shaftconnected with said other sprocket wheel. r

In testimony that I claim the foregoing as my own, I have hereto aifixedmy signature in the presence of two witnesses.

ARTHUR B. EMORY.

Witnesses:

J. M. RAGSDALE, SHELA ERBANKS.

Copies oi this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

